I'm looking more for, something like Ground Services X, or FS2 Crew, or something that will make it feel more like a real experience, what should I look at first?

fs2crew is a great program,but nedds some voice training.

well I can give you my top immersive addons which I chose over last few months

 

1. PMDG 737 NGX - as a best jet ever made (if you're into jets) 

2. FS2Crew voice edition

3. GSX

4. FTX Global + FSGlobal2010 + FTX Vector + any landclass you choose (or like I do wait for OpenLC from Orbx) - this whole package may seem expensive and is not as good as particular regions but for IFR flights I didn't need anything more to take my sim to 2013/2014. 

5. REX 4 Direct + Active Sky Next + Shade with Mark's final preset - chose those three because when they're mixed they give you most uber ultimate experience weather & environment wise

6. MyTraffic 2013/MyTraffic X 5.4

 

Have more addons on PC but TBH these are the ones which I could not live without and I don't regret spending money for them. Each one of them increases immersion. 

I'm not looking for scenery or aircraft, more for something like posted in my original post. Please read the actual post.

GSX and FS2Crew are TOTALLY different tools so it was hard to say what you actually need. They don't belong to same category in no way. Peace.

FS Captain.

Multi Crew Experience.